• The question isn't answerable: if you accept the standard model of physics, its impossible to travel faster than light. So, you can't expect that same model of physics to tell you what would happen if you did exceed the speed of light. A physicist would just raise an eyebrow and ask "what part of 'impossible' don't you understand?.
  • According to the laws of physics - you can't. Only something without any mass can travel at the speed of light, as you have a mass (no offense!) you can't go that fast. Hypothetically, if you did go faster than light you may go back in time! This is what a previous theory in physics said, before it was replaced. To explain using a simple method: 1. A clock strikes 12 noon, billions of beams light reflect off the clock, some go into your eye, so you can now see its 12 noon. 2. You start running really fast, at the exact speed of light. You are now running with the beams of light that "say" 12 noon, time doesn't change. 3. You run even fster and start catching up with ohter beams of light that "say" 1155, 1150, 1145 etc. You are now going back in time! This is a simple example of how time changes relative to speed. You can't actually go faster than light and go back in time, but the general theory is true. Clocks on rockets (which travel incredabily quickly) come back several seconds out, down to the speed it was going. So spend your entire life running as fast as you can and you may live a few seconds longer!
  • Practically still we are not yet so advanced but theoretically might be possible as speed of rotation of earth is less than the speed of light so if we can travel with speed more than light we can get back into past(time machine) or into different dimension
  • The question is whether you can exist in two places at once. Quantum mechanics technically doesn't violate relativity, because although there is an equal probablility at any instant that you might see a particle in one place or another, until you check you never really know where the particle is (if it is a particle at all). Traveling faster than light though doesn't make you go "back in time," it just makes the order of events dependent on your inertial reference frames. All events separated by less than the speed of light (for instance, if two lights go off in times differing by more than the time required by light to reach one light from another) have a definite "order" of events. Otherwise, the order in which two events occur depends on your inertial reference frame. Traveling "faster" than light in one inertial reference frame would mean "teleporting" somewhere else: basically you'd need to exist in two places at once.

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